Position-bracket for sewing-machines



G. JACKSON. POSITION BRACKET FOR SEWING MACHINES..

APPLICATION fILED SEPTI], I911- Patented Aug. 16,1921.

ge Jackson IN V EN TOR.

ATTOIRNEYS.

UNITED STAKES PATENT OFFICE.

GEORGE JACKSON, OF CHICAGO, ILLINOIS, ASSIGNOB, BY DIRECT AND MESN E ASSIGN- llIIENTS, TO THE SINGER MANUFACTURING- COMPANY, A CORPORATION OF NEW JERSEY.

Specification of Letters Patent.

Patented Aug. 16, 19 21.

Application filed September 7, 1917. Serial No. 190,155.

I! '0 all whom it may concern Be it known that I, Gnonen JACKSON, a citizen of the United States, residing at Chicago, in the county of Cook and State of illinois, have invented new and useful Improvements in Position-Brackets for Sewing-Machines, of which the following is a specification.

This invention relates to sewing machines of the oscillating hook ty e, as disclosed, for example, in the United gtates patent to P. Diehl & A. Grieb, No. 663,696, issued Decemher 11, 1900, and its object is to provide a new and improved holder or position bracket for the thread-case which is so constructed that the thread-case can be removed from the loop-taker of the machine, without removal or detachment of the holder or any of its parts, thus facilitating the removal of obstructions which may have lodged in the flangeand-groove connection between the thread-case and the loop-taker or which may have been deposited in the cavity of the sewing machine bed-plate in which the lower thread-handling devices are located.

In the preferred form of the improvement the thread-case holder is provided with a readily shiftable device which can be swung out of its normal position to facilitate the lateral displacement of the thread-case and preparatory to its removal from the looptaker.

In the accompanying drawings, Figure l is an elevation of a portion of a sewing machine to which the improved thread-case holder is applied. Fig. 2 is a plan of the parts below the line 2-2 of Fig. 1. Fig. 3 is a .view similar to Fig. 2, with the throat plate and cover-plate removed. Fig. 4: is a perspective view of the improved holder or position bracket. Fig. 5 is an elevation of the latter showing the movable part swung out of its normal position, and Fig. 6 is an enlarged section on the line 66 of Fig. 3.

Referring to the drawings, 20 denotes the bed-plate of the machine in which is formed; the cavity 21 for housing the lower thread handling mechanism and across the bottom of which extends a bracket 7 forming a bearing support for the vertically disposed hook-shaft 22 which is suitably actuated by mechanism fully disclosed in the Diehl &

loop-taker 23 connected to the shaft by an arm or spoke 24, said hook having an inwardly extending rib or flange 25, on the "Inner face of which is formed a loop-seizing beak or hook by means of which loops of thread from the needle 26 are seized and carried around the segmental thread-case 8.

To support the thread-case upon the looptaker, the former is provided with a peripheral groove 27 which is entered by the rib or flange ofthe loop-taker 23. The threadcase 8 is suitably recessed to receive a bobbin 28 containing a mass of lower thread.

In order to retain the thread-caseS in cooperative relation with the loop-taker 23 a holder or position bracket 5 is provided which is attached to the bracket .7 by the screw 6. One end of the holder 5 is formed w1th a needle-guard 9 while its other end is provided with a loop-guard 10 which extends over the flange 25 of the loop-taker 23. Suitably journaled upon the holder 5 is the bobbin-ejecting lever 11 having an arm extending below the bobbin 28 disposed within the thread-case 8. As so far described the construction does not. difier substantially from that disclosed in the Diehl & Grieb patent above referred to, the loop of needle thread being passed about the thread-case in substantially the same manner as in thatof the patented construction.

According to the present improvement the holder 5 comprises a device or section 12 readily shiftable out of operative relation with the thread-case and holder and located on that side of the holder which faces the thread-case 8 and contacting with the latter. In one form of the improvement the holder has been reduced in width to accommodate the movable section or element and the latter is pivoted to the holder by a screw 13 so that it may be swung upwardly from its operative position between the thread-case and the fixed portion of the holder to permit disengagement of the interlocking flangeand-groove connection between the looptaker and thread-case and the removal of the latter from the former. The end of the movable section 12, adjacent the loop-guard 10 of the holder 5, is provided with a finger 14 notched at 15 to receive a screw-driver or finger-nail to facilitate the lifting of the movable section of the holder away from the thread-case 8 and permit the latter to be displaced transversely of the axis of movement of the loop-taker or in a direction parallel with its plane of movement preparatory to its removal from cooperative relation with the loop taker. After the thread-case 8 has been removed from its operative position within the loop-taker 23, the groove 27 of the threadcase and the flange 25 of the looptaker may be readily cleared of any obstruc tion such as lint or thread ends which may have prevented the free movement of the loop-taker about the thread-case. Removal of the thread-case will also give access to the cavity 21 in the bed-plate to facilitate the removal of any foreign matter which may have found lodgment upon the bracket 7.

To restore the thread-case 8 into operative relation with the loop-taker, it is lowered into position until its groove 27 is opposite the flange 25 of the loop-taker when by a slight lateral movement, the flange of the loop-taker will again be engaged by the groove in the thread-case whereupon the movable section 12 of the holder can be lowered to resume its operative position between the fiXed portion 5 of the holder and the thread-case. The parts are then in the proper relation for a sewing operation.

The side of the movable section 12 of the holder which faces the thread-case 8 is provided witlra cushionor buffer-spring 16 having its free end curled around a shoulder 17 beneath the finger 14. The spring 16 atfords a yielding contact between the threadcase 8 and its holder and serves to deaden any noise which might be occasioned by contact of the parts in the operation of themachine.

The bed-plate 20 of the machine is rccessed to receive the usual cover-plate 29 and throat-plate 30, the latter being provided with the usual needle-hole 31 and feed-dog slots 32.

Having thus set forth the nature of the invention, what I claim herein is 1. In a Sewing machine, in combination, a circularly movable loop-taker, a threadcase having at one side a bearing in and supported by said loop-taker, and a holder having a portion adapted for engagement with the other side of said thread-case to confine it to said bearing and to retain it from movement with the loop-taker, said portion of the holder-being ritractablc from normal effective relation with the threadcase to permit removal of the latter from the loop-taker.

2. In a sewing machine, in combination, a loop-taker, a thread case, a holder positioned within said loop-taker for retaining said case in cooperative relation therewith, the holder comprising a detaining element readily retrr-ictable about a permanent fulcrum out of normal working position to permit re moval of the thread-case from the loop-taker.

3 In a sewing machine, in combination, a loop-taker, a thread-case, a holder positioned within said loop-taker for retaining said case in cooperative relation therewith, the holder comprising a buffer-spring and a support therefor pivotally mounted for retraction from normal position to permit removal of the latter from the loop-taker.

In a sewing machine, in combination, a loop-taker a thread-case. a holder positioned within said loop-taker for retaining said case in cooperative relation therewith, the holder comprising a buffer-spring and a support therefor pivotally mounted upon a fulcrum arranged transversely of the axis of movement of the loop-taker to permit retraction of the buffer-spring from the threadcase and removal of the latter from the loop-taker.

5. In a sewing machine, in combination, a circularly moving loop-taker, a thread-case having at one side a peripheral bearing thereon by which it is sustained freely movable toward and from the axis of movement of the loop-taker, and a holder adapted to bear upon the opposite side of said threadcase for normally confining it to said bearing and for restraining it against movement with the loop-taker, means being provided for affording abnormal clearance between the holder and thread-case to permit removal of the latter from said loop-taker.

G. In a sewing machine, in combination, a circularly movable loop-taker, a thread case, a flange-and-groove connection between the two whereby the thread-case is supported within the field of action of the loop-taker, and holding means for restraining said case from movement with said loop-taker said holding means including a device for rendering it ineffective whereby to permit removal of the thread-case from the loop-taker.

In testimony whereof I aflix my signature.

GEORGE JACKSON. 

